Milling-cutter



.BE C HTOL. MILLING CUTTER.

(No Model.)

Patented Jan; 9, 1894.

m M fl k r B B T A C t wJ M G "ATENT GEORGE T. BEGHTOL, 0F ELMIRA, NEWYORK.

MILLING-CUTTER.

SPECIFICATION forming part of Letters Patent No. 512,463, dated January9, 1894. Application filed March 1, 1:893. Serial No. 464,24 9- (Nomodel.)

York, have invented a new and useful Mill ing-Cutter, of which thefollowing is a specification.

This invention relates to milling cutters for surfacing wood and metal;and it has for its object to provide certain improvements in cutters ofthis character whereby the cutting teeth or knives thereof will lastlonger and can be manufactured so as to haveauniform temper throughoutwhich cannot be secured in cutters of this character where the body andthe cutting edges are all a single piece of metal.

To this end the main and primary object of the invention is to provide amilling cutter, which, owing to the disposition of the knives, canemploy a less number of knives and at the same time secure a very rapidcut and can be used by re-sharpening until they are almost completelyworn away.

With these and many other objectsin view which will readily appear asthe nature of the Y invention is better understood,the same consists inthe novel construction, combination and arrangement of parts hereinaftermore fully described, illustrated and claimed.

In the accompanying drawings:-Figure 1 is a perspective view of amilling cutter constructed in accordance with this invention. Fig. 2 isa central longitudinal sectional view of the same. Fig. 3 is an enlargedtransverse sectional view thereof.

Referring to the accompanying drawings, A represents a hard metal tubethat is designed to fit the mandrel or spindle B, of any suitablemachine which may be employed for driving the cutter in surfacing metalor wood. The said metal tube A, is provided with a series oflongitudinal peripheral metal-grooves 0, into which runs the metal ofthe cylindrical cast cutter or knife body D. The cylindrical body D,which is cast permanently onto the inner tube A, is preferably ofBabbitt metal, but of course may be any other soft metal body, and evencast iron. When the cylindrical body D, is cast onto the inner tube A,at the same time, a parallel series of steel cutter knives E, ispermanently cast longitudinally into said body so as to project beyondthe periphery thereof. The steel cutter knives E, are provided withouter beveled cutting ends F, and while being uniformly parallel witheach other in the periphery of the cast body, the same are also disposedspirally and longitudinally in the said body, in order to secure a rapidsliding out of the Object being surfaced. It will be readily apparent tothose skilled in the art; that by disposing the projecting cutterknives,

' or more properly speaking knife ribs E, spirally, the same can bearranged in a less nu mber on the cutter body than in ordinary cuttershaving straight knives, for the reason that before one knife has barelycommenced to cut, the next following knife has already started in, sothat a rapid effective out can be secured. Furthermore, it may be wellto observe that not only is the cost of the cutter materially lessenedby employing a less number of the tempered knives, but at the same time,by providing a construction which allows the knives to be widelyseparated, wider spaces are left between the cutters for the chips, soas to prevent clogging. By having a soft metal cast body, the knives canbe worn almost completely out, inasmuch as the same need not necessarilybe very wide and can therefore be of a uniform temper throughout, andwhen the same are worn close to the soft metal body, such body can bereadily filed down below the plane of the cutting edges so as to exposemore of the knives, thus insuring the use of the knives until almostcompletely worn away.

From the foregoing it is thought that the construction and manyadvantages of the herein described milling cutter will be readilyapparent.

Having thus described my invention, what I claim, and desire to secureby Letters Patent, isa In a milling cutter, the combination of an innerhard metal tube provided with a peripheral series of longitudinal metalgrooves, a cylindrical shell or body of soft metal permanently castabout the hard metal tube and into the peripheral grooves thereof, and aseries of parallel spirally disposed tempered cutter knife ribs castpermanently and lon- In testimony that I claim the foregoing asgitudinally into said shell or body and promy own I have hereto aifixedmy signature in IO vided wit]; outer beveled. cutting edges, the thepresence of two Witnesses. portions 0 the soft metal shell or body be- 11 r 5 tween said knife ribs being adapted to be re- GEORGE BEUIFOL'duced below the plane of said cutting edges Witnesses: as said kniferibs wear away, substantially as WILLIAM LANG, set forth. KITTY JACOB.

